I need to show gridview in alert dialog. But i stuck with the error
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.GridView.setAdapter(android.widget.ListAdapter)' on a null object reference
My code...
listView_prev.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, final View arg1, int arg2, long arg3) {
//listview click event handling
TextView id = (TextView) arg1.findViewById(R.id.textView17);
final int id_To_Search = Integer.valueOf(id.getText().toString());
Cursor item=mydb.singlecons(id_To_Search);
Cursor att=mydb.attrs(id_To_Search);
Cursor picloc=mydb.singleconspic(id_To_Search);
att.moveToFirst();
List<String> list = new ArrayList<>();
// Log.d("temp",att.getColumnName(1));
while (!att.isAfterLast())
{
int l=att.getColumnCount();
Log.d("length", String.valueOf(l));
for(int i=2;i<l;i++){
Log.d("for","for");
if(att.getString(i)!=null){
String b= att.getColumnName(i)+" "+att.getString(i);
list.add(b);
Log.d("att",b);
}
}
Log.d("while","while");
att.moveToNext();
}
att.close();
Log.d("list", String.valueOf(list));
picloc.moveToFirst();
FilePathStrings = new String[picloc.getCount()];
int i=0;
while (!picloc.isAfterLast()){
Log.d("picloc",picloc.getString(2));
FilePathStrings[i]=picloc.getString(2);
i++;
picloc.moveToNext();
}
item.moveToFirst();
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(Consultation.this);
LayoutInflater inflater = getLayoutInflater();
View dialogView = inflater.inflate(R.layout.alert_label_editor, null);
dialogBuilder.setView(dialogView);
TextView con=(TextView)dialogView.findViewById(R.id.textView29);
con.setText("Consultation on "+item.getString(4));
TextView des=(TextView)dialogView.findViewById(R.id.textView28);
des.setText(item.getString(2));
TextView pre=(TextView)dialogView.findViewById(R.id.textView31);
pre.setText(item.getString(3));
TextView fee=(TextView)dialogView.findViewById(R.id.textView32);
fee.setText(item.getString(5));
adapter1 = new GridViewAdapter(FilePathStrings,getApplicationContext());
grid.setAdapter(adapter1);
AlertDialog alertDialog = dialogBuilder.create();
alertDialog.show();
Gridviewadapter.java
class GridViewAdapter extends BaseAdapter {
private String[] filepath;
private static LayoutInflater inflater = null;
GridViewAdapter(String[] fpath,Context context) {
filepath = fpath;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return filepath.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.gridview_item, null);
ImageView image = (ImageView) vi.findViewById(R.id.image);
Bitmap bmp = BitmapFactory.decodeFile(filepath[position]);
image.setImageBitmap(bmp);
return vi;
}
}
Alertlabeleditor.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:paddingTop="10dp"
android:paddingBottom="20dp">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView29"
android:layout_weight="1"
android:gravity="center"
android:textSize="24sp"
android:layout_marginBottom="10dp"
android:textStyle="normal|bold" />
</LinearLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:text="Description"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textView27"
android:layout_weight="2" />
<TextView
android:text="TextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textView28"
android:layout_weight="1" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:text="Prescription"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textView30"
android:layout_weight="2" />
<TextView
android:text="TextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textView31"
android:layout_weight="1" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:text="fee"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textView33"
android:layout_weight="2" />
<TextView
android:text="TextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textView32"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
</ScrollView>
<GridView
android:id="@+id/gridview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:columnWidth="90dp"
android:numColumns="auto_fit"
android:stretchMode="columnWidth" />
</LinearLayout>
How can i resolve this issue.? Where is the error occurring in my code? I know null pointer error due to accessing values from where there is no value, but i cant figure it out where this is occurring and how can i resolve it. How can i solve this issue.?
